/*
 * Bytecode Analysis Framework
 * Copyright (C) 2005, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package edu.umd.cs.findbugs.ba.interproc;

import java.io.IOException;
import java.io.Writer;

import org.apache.bcel.Constants;

import edu.umd.cs.findbugs.ba.XFactory;
import edu.umd.cs.findbugs.ba.XMethod;
import edu.umd.cs.findbugs.classfile.DescriptorFactory;
import edu.umd.cs.findbugs.classfile.MethodDescriptor;
import edu.umd.cs.findbugs.util.ClassName;

/**
 * A MethodPropertyDatabase keeps track of properties of
 * methods.  This is useful for implementing interprocedural analyses.
 * 
 * @author David Hovemeyer
 */
public abstract class MethodPropertyDatabase<Property>
	extends PropertyDatabase<MethodDescriptor, Property> {

	@Override
	protected MethodDescriptor parseKey(String methodStr) throws PropertyDatabaseFormatException {
		String[] tuple = methodStr.split(",");
		if (tuple.length != 4)
			throw new PropertyDatabaseFormatException("Invalid method tuple: " + methodStr);

		try {
			int accessFlags = Integer.parseInt(tuple[3]);
//			return XFactory.createMethodDescriptor(XFactory.canonicalizeString(tuple[0]),
//					XFactory.canonicalizeString( tuple[1]), XFactory.canonicalizeString(tuple[2]), accessFlags);
			String className = XFactory.canonicalizeString(tuple[0]);
			String methodName = XFactory.canonicalizeString(tuple[1]);
			String methodSig = XFactory.canonicalizeString(tuple[2]);
			return DescriptorFactory.instance().getMethodDescriptor(
					ClassName.toSlashedClassName(className),
					methodName,
					methodSig,
					(accessFlags & Constants.ACC_STATIC) != 0);

		} catch (NumberFormatException e) {
			return null;
		}
	}

	@Override
	protected void writeKey(Writer writer, MethodDescriptor method) throws IOException {
		writer.write(method.getClassDescriptor().toDottedClassName());
		writer.write(",");
		writer.write(method.getName());
		writer.write(",");
		writer.write(method.getSignature());
		writer.write(",");
		if (method instanceof XMethod) 
			writer.write(Integer.toString(((XMethod)method).getAccessFlags() & 0xf));
		else
			writer.write(String.valueOf(method.isStatic() ? Constants.ACC_STATIC : 0));
	}
}
